Abstract:
:Previous work has hinted that prospective and retrospective coding modes exist in hippocampus. Prospective coding is believed to reflect memory retrieval processes, whereas retrospective coding is thought to be important for memory encoding. Here, we show in rats that separate prospective and retrospective modes exist in hippocampal subfield CA1 and that slow and fast gamma rhythms differentially coordinate place cells during the two modes. Slow gamma power and phase locking of spikes increased during prospective coding; fast gamma power and phase locking increased during retrospective coding. Additionally, slow gamma spikes occurred earlier in place fields than fast gamma spikes, and cell ensembles retrieved upcoming positions during slow gamma and encoded past positions during fast gamma. These results imply that alternating slow and fast gamma states allow the hippocampus to switch between prospective and retrospective modes, possibly to prevent interference between memory retrieval and encoding.
journal_name
Neuronjournal_title
Neuronauthors
Bieri KW,Bobbitt KN,Colgin LLdoi
10.1016/j.neuron.2014.03.013subject
Has Abstractpub_date
2014-05-07 00:00:00pages
670-81issue
3eissn
0896-6273issn
1097-4199pii
S0896-6273(14)00241-4journal_volume
82pub_type
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